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Da. 13, 1927. Y

Y, r. F. oNElLl. ET AL Re' 16819 WARM AIR SYRINGE Original Filed Nov. 25, 1924 Si 0,4, f

Reissued Dec. 13, 1927.

UNITED'STATES 'PATENT orrics. j

THOMAS l1r. loNELL, 0F NEW HAVEN, coNNEcTiCUT, Ann munizioni) J. MILLER, or

NEW YORK, N. Y., ASSIGNOBS TO ALPHONSE'I.

WARM-AIR SYRINGE.

PIEPER, OF NEW YORK, N. Y.

original No. 1,542,472, dated June 16,1925, Serial No. 752,103, iled November 25, 1924. Application for reissue led April 1, 1927. Serial No. 180,104.

Fig. 1 is a side view of a Warm-air syringe constructed in accordance with om` invention.

Fig. 2 is a sectional view showing the same ,set into an electric heater.

This invention relates to improvement in warm-air syringes, such as are commonly used in dentistry and surgery. Most dentists equipment includes an electric heater,

)cinto which tubular li uid containers may be placed and by whic I the liquid may be cated to the desired temperature. Air for drying cavities, etc., is commonly used, and the object of this invention is to rovide a 16 device by which air may be readi y heated in an ordinary electric heater, without requiring further equipment than that commonly possessed by dentists and surgeons, and the invention consists in the construction as hereinafter described and particularly recited in the claims.

In carrying out our invention, we employ `i a tubular casing 5 of copper or any other suit-able material, provided with a head 6,

preferably having threaded engagement with the casing, so that it may be removed. This head mounts an inlet-nipple 7 and an out-l let-nipple 8, and is preferably provided with a centrally-arranged vent 9, the inlet-nipple.

being connected with the usual source of airsupply either from a compressed-air tank or -from a foot or otherwise operated bellows,whi1e the outlet-nipple 8 is provided with4 a small perforation 10 through which air may escape. The inlet-nipple 7 is connected with one end of a coil 11 Within the casing 5. From the lower end of the coil the pipe is extended upward through the coil and into connection with the nip" le 8.

e casing may be filled, or partly filled, Withliquid, if desired, as this will facilitate the distrilmtiony of heat. The casing corresponds in size to standard spray bottles and is adapted to be entered into a standard electric heater 12 so that air in the coil is heated to the desired tem erature, and a suliicient amount of air wil be uniformly heated to last for the desired period.

outlet- A feature of this invention is that it can be produced at a comparatively low cost and y over electrically-heated coils.

1. A warm-air syringe, comprising a tubular casing adapted to be entered into an electric heater, said easing provided with a removable head, said head provided with inletand outlet-nipples, a'y coil within said casing, one end of the coil connected With the inletnipple, and the other end ofthe coil connected with the outlet-nipple.

2. A' Warm-air syringe, comprising a tubular casing adapted tobe entered into an electric heater, sald casing provided With a removable head, said head provided with inletand outlet-nipples, a coil within said casing, one end of the coil connected with the inletnipple and they other end of the coil connected with the outlet-nipple, and a vent through said head.

3. In combination, an electric heater in the form of a receptacle, a coiled tube removably inserted in said receptacle, one end of said tube being` connected to an air supply, and an outlet nipple connected to the other end of said tube.

4. In combination, an electric heater in the form of a'receptacle, al casing removably inserted in said receptacle, a coiled tube hung in said casing, and inlet and outlet nipples mounted on the top of said casing and connected respectivelytoy the ends of said tube.

tube for connection with' an air supply a .is not possible when it is heated by passing syringe nozzle at the other end of said tube, said casing, tube, connection and nozzle being rigidly secured together and removable from said heater as a unit.

6. In combination, an electrirJ heater in the .fo'mbf :L well vithrga heating, element in the wall thereof, a, coiled tube with vterminals 'et the same end of thecol removably inserted in said Well, a, hose connecting nipple on one of said termina-ls, and an outlet 10 nipple on the other of said terminals.

In Witness whereof, We have hereunto set our hands at New York, New York, this 21st day of February, 1927 THOMAS r.- ONEILL.

RAYMOND J. MILLER. 

